After abandoning my latest fortress, I looked at one of my dogs in legends mode (she became a historical figure for killing a goblin). She is a casual worshiper of one of the dwarven gods. That dog's children are also historical figures, and all of them also worship a god.

learningtimebuster reported in 0010350 this issue can affect also horses struck by the adventurer. Animals trying to worship some gods and not succeeding may be why they are then getting distracted, noted by sv-esk in 0009567:0034816. That Button's save (http://dffd.bay12games.com/file.php?id=11767 [^]) sv-esk was talking about shows some (distracted) goats-worshipers.